import templates from '../render-templates/templates'

let cache = {};
export default function tmpl(str, data) {
    // Figure out if we're getting a template, or if we need to
    // load the template - and be sure to cache the result.
    let fn = /^[-a-zA-Z0-9]+$/.test(str) ?
        cache[str] = cache[str] ||
        tmpl(templates[str]) :
        // Generate a reusable function that will serve as a template
        // generator (and which will be cached).
        new Function("obj",
            "var p=[],print=function(){p.push.apply(p,arguments);};" +

            // Introduce the data as local variables using with(){}
            "with(obj){p.push('" +

            // Convert the template into pure JavaScript
            str
                .replace(/[\r\t\n]/g, " ")
                .split("{%").join("\t")
                .replace(/((^|%})[^\t]*)'/g, "$1\r")
                .replace(/\t=(.*?)%}/g, "',$1,'")
                .split("\t").join("');")
                .split("%}").join("p.push('")
                .split("\r").join("\\'")
            + "');}return p.join('');");
    // Provide some basic currying to the user
    return data ? fn(data) : fn;
};